The EU hit Google with a record 2.4-billion-euro fine Tuesday for illegally favoring its shopping service in search results, in a fresh assault on US firms that risks the wrath of President Donald Trump.

Hard-charging European Commission competition chief Margrethe Vestager said the tech giant "abused its market dominance" as the world's most popular search engine to give an advantage to its Google Shopping service.

"It denied other companies the chance to compete on the merits and to innovate. And most importantly, it denied European consumers a genuine choice of services and the full benefits of innovation."

Google now has 90 days to "end this conduct" or face further fines, Vestager said. These could amount to five percent of Google's daily revenue, she added, a penalty of roughly $14 million a day.

The fine broke the previous European Union record for a monopoly case against US chipmaker Intel of 1.06 billion euros in 2009.

Google said it "respectfully" disagreed with the EU decision, which followed a seven-year investigation, and may appeal.

"When you shop online, you want to find the products you're looking for quickly and easily. And advertisers want to promote those same products," Kent Walker, Google's senior vice president and general counsel, said in a statement.

"That's why Google shows shopping ads, connecting our users with thousands of advertisers, large and small, in ways that are useful for both.

"We will review the Commission's decision in detail as we consider an appeal, and we look forward to continuing to make our case."

Google Shopping shows the images and prices of products in response to shopping-related searches when someone uses the search engine.